fit.surr                Fit marginal and conditional state-space models
                        for longitudinal surrogate evaluation
lagged                  Compute lagged values of a vector
plot.fitted_onlinesurr
                        Plot time-varying PTE measures and treatment
                        effects from a '"fitted_onlinesurr"' object
s                       Construct a B-spline basis matrix
sim_onlinesurr          Simulated longitudinal surrogate dataset for
                        'OnlineSurr'
summary.fitted_onlinesurr
                        Summarize a '"fitted_onlinesurr"' object
time_homo_test          Test time-homogeneity of the PTE
